Protection against relay attack for keyless entry systems in vehicles and systems

A method comprising:

• wirelessly receiving, by a processing system including a processor, from a remote system a request to enable a first operation of a device;
• performing, by the processing system, an exchange of signals with the remote system;
• determining, by the processing system, random time intervals to transmit a group of challenge signals to the remote system;
• selecting, by the processing system, one or more software loops for use in a challenge signal from the group of challenge signals for the remote system;
• wirelessly transmitting, by the processing system, the challenge signal from the group of challenge signals to the remote system based on the random time intervals, each challenge signal specifying the selected one or more software loops;
• wirelessly receiving, by the processing system, a response signal from the remote system in response to each challenge signal from the group of challenge signals resulting in a group of response signals, the response signal having a response signal power level and a response signal delay;
• analyzing, by the processing system, each response signal by comparing the response signal power level of each response signal and the response signal delay of each response signal respectively with stored values of power and delay associated with the selected one or more software loops resulting in an analysis;
• determining, by the processing system, a distance between the remote system and the device based on a round trip time (RTT) associated with each of the challenge signal and the response signal resulting in a determination;
• based on the analysis and the determination, enabling, by the processing system, the first operation associated with the request;
• determining, by the processing system, a trajectory of the remote system based on receiving each response signal of the group of response signals;
• and
• enabling a second operation based on the trajectory.

A non-transitory machine-readable medium comprising executable instructions that, when executed by a processing system including a processor, facilitate performance of operations comprising:

• wirelessly receiving from a remote system a request to enable a first operation of a device;
• performing an exchange of signals with the remote system, the exchange of signals comprising an exchange of digital certificates;
• determining random time intervals to transmit a group of challenge signals to the remote system;
• selecting one or more software loops for use in a challenge signal from the group of challenge signals for the remote system;
• wirelessly transmitting the challenge signal from the group of challenge signals to the remote system based on the random time intervals, the challenge signal from the group of challenge signals specifying the selected one or more software loops;
• wirelessly receiving a response signal from the remote system in response to each challenge signal from the group of challenge signals resulting in a group of response signals, the response signal having a response signal power level and a response signal delay;
• analyzing each response signal by comparing the response signal power level of each response signal and the response signal delay of each response signal respectively with stored values of power and delay associated with the selected one or more software loops resulting in an analysis;
• determining a distance between the remote system and the device based on a round trip time (RTT) associated with each of the challenge signal and the response signal resulting in a determination;
• based on the analysis and the determination, enabling the first operation associated with the request;
• determining a trajectory of the remote system based on receiving each response signal of the group of response signals;
• and
• enabling a second operation based on the trajectory.